Report copyright - 阿超數學、國中數學 - Doc1 · : , IOa-15b-27= ? 2a-3b—8 IOa-15b 40 o, : E x-åy=8 , : 12 , 14-6a+20b= ? 1.234x-5.678y+250= ? 320x-240y-1600 40x-30y-360= ? 38 39 40 41 6x-9y—21
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